Jacquard loom



Oct 9 1924 J. VIETZE JACQUARD LOOM Filed June 2. 1923 Patented Oct. 28, 1924.

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JACQUARD LOOM.

Application filed .Tune 2,

To all whom t may concern.'

Be it known that I, JOSEPH VIETZE, a citizen of the United States, and a resident of Hyde Park, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in J acquard Looms, of which the following is a full, clear, concise, and exact description.

My present invention relates to looms, and more particularly to a safety device for looms of the Jacquard type.

In prior Jacquard machines utilizing the ordinary griff, there was a tendency on the part of the hook to swing under the blades 2 of the gri as the grii descended. Various expediencies were designed to overcome this fault, such as deepening the blades of the griff, providing auxiliary griff blades, and the like. None of these was satisfactory, however, as'the use of deep blades made it diiiicult to replace broken hooks while with the use of auxiliary grift1 blades,

,the hook had a tendency to swing back under the auxiliary blade because ofthe great lengthof the hook, and vparticularly When the loom was run at a high speed. An other serious defect in prior machines was Y due to the complete derangement of the hooks and their'associated needlesl because of the frequent breaking of the pin connecting the connecting rod with the grate operating lever andpwhen this contingency happened, the entire grate bar fell to such a distance that the lower end 0f the hooks restingon the bars of the grate no longer supported the upper end of the hooks in operative relation with the griff blades and consequently when the hookwas lowered, the. upper end thereof swung under the griff blade and necessitated frequent adjustment and replacement of parts.

In my present invention I have overcome defects of prior apparatus of this type and have associated with the Jacquard loom an adjustable stop bar which is associated with the grate in such a manner as to limit the downward movement thereof and prevents, in this manner, such grate, with its asso ciated grate bars, from ever falling or dropping to such a level as to allow the upper end of the hooks to become deranged with respect to the griff blades. Regardless of whether or not, therefore, the pin connecting the connecting rod with the grate operating lever breaks, there is no possibility, in my improved device, of any damage resulting 1923, Serial No. 642,997.

to the loom or any of its parts from this cause.

The object of my invention, therefore,V is an improved safety device forlooms of the Jacquard type,insu`ring the safety of vertically arranged hooks.

In the accompanying drawings illustrating the preferred embodiment of my invention,

\ Fig. 1 is a side elevation;

Fig. 2 is a fragmentary sectional on the line 2-2 of Fig.v 1; 'f I Fig. 3 is a perspective diagram illustrating the relation of my improved safety deving;J yto the grate and vassociated elements, an Y Fig. 4 is a perspective View of my improved safety bar.

Referring to the drawings, 10 designatesa base plate of the machine having mounted thereon a framework 11 and within the limits of which is located the operating mechanism of the loom.A vl-lirranged within the elevation framework 11 and on one side thereof is a needle plate or board 12 through which eX- tends a plurality of parallely arranged needles 18 in the usual manner, and these needles may extend through a pattern plate 14 on the same side of the machineand into a spring boxv 15 on theopposite side, as is usual in machines of this character. Each of the needles 13 is provided with la, hook portion 16 associated with a vertically mounted hook 17, the top end vof which is adapted to be ordinarily'engaged by a griff blade 18'constituting one element Vof a griff, such griff being. comprised of a plurality of parallely arranged blades 18 secured Pto a cross bar 19 .which,.in turn. hasipi'votally mounted thereto at its upper end a connecting rod 20 associated with an operating lever 21 operated in the usual manner and by means of which the ygriff is o-perated. The upper portion of the hook 17 normally hooked over the griff blades 18, while the hook 22 on each of the hooks 17 is adapted to be engaged by one or the other of the grate bars V23 as the hooks are moved vertically by the griff. These grate bars are arranged below and parallel to the griff blades 18 and have their ends secured in a grate frame 24 which is arranged for vertical sliding movement in the frame 11, a connecting rod 25 pivotally'attached to the grate frame 24: having its lower end pivotally connected to a grate operating lever 2G, both the grate llO Lil)

operating lever and the griff operating lever being pivotally mounted intermediate their ends in a suitable bearing in a boss 27 formed integral with, or secured to, the top of the base 10. To the outer free: end of the grate operating lever 26 is pivotally connected the upper end of a connecting memn ber 28 by a pin 29.

The ends of the needles, extending through the needle plate er board 12, encounter the pattern plate ll/l of the device and certain predetermined ones of the needles 13 have the hook portion 1G thereof broughtfi-rmly against their associated hooks 17 and, on the next upward movement of the grate 24, such predetermined hooks 17 are lifted olf the griff blades 18 and forced laterally with respect thereto, so that, on the next downward movement of the grate 24, such upper ends of the hooks 17 fail to register' with the griff blades 18 and therefore fall below the upper edge of such griff blades. lf the downward movement of the grate frame 24 is toor great, the upper end of the hook 17 may swing inward into such a position as to engage with the bottom edge of the griff blade 18 and, on the next upward movement ofthe grate frame 2li, such hook will be jammed against the lower edge of the griff blade and buckled, thereby 'throwing the. entire apparatus out of adjustment and' necessitating renewal of the hook and readjustment of the parts. lhe pin 29 is frequentlyy broken because of the rapid movement and jarring ofthe entire machine, in

which case the grate frame 24C drops downv.iardly below its normal level and throwing the entire set of vertically arranged hooks 17 out ofv adjustment and, necessitating. the entire resetting of the machine. To obviate thisdefect, l have arranged a safety bar 3() provided onl its ends with downwardly and rearwardly extending enlargements 31 each providedr with a vertically arranged slot 82 adapted to register with slots S3 in the framework 11 and through` which, and the slots`32, entendV bolts 3d and by means of which. the bar may be adjusted vertically with respect to the framework 11. On the upper face of the bar 30 formed integral therewith and extending parallel thereto is a ledge 35 which is adapted to engage with a face 36 on the lower edge of the front of the grate frame 24. The bar 30 is set by means of the adjusting screws or bolts 34- with relation to the grate frame 24 so that, in the extreme downward permissible limit of the grate frame 24, the face 36 is engaged by the ledge 35. The device may now be operated in the usual manner, but, regmdless of whether or not the pin 29 breaks or whether or not the griff blade employed is short or long, there is no danger of the upper end of the hooks 1T being engaged and damaged by the griff blades.

While I have necessarily shown and de scribed the preferred embodiment of my invention somewhat in detail,it is to be understood that l may vary the size, shape, and arrangement of parts within wide limits without departing from the spirit of the invention. Y

Having thus described my invention, what I claim as new is:

1. ln a device of the kind described, the combination of a frame,4 a grate frame mounted for reciprocation in a vertical plane in said framework, and, a safety bar adjustably mounted in the framework vand adapted to be engaged by, and limit, the downward movement of the. grate frame.

2. ln a device of the kind described, the combination of a griff blade, a grate bar, means for moving said griff blade and grate bar in a vertical plane and independently of each other, a hook carried by the grate bar and adapted to engage with the Vgriff blade, means for moving said hook laterally of the griff blade at predetermined times, and means cooperating with the grate bar for preventing injury to the. hook when the upper end of such hook is disengaged. from the griff blade.

In witness whereof l hereunto subscribe my name this 21 day of April, 1923. 

